refactor: remove frontend dead code (orphaned files, unreachable exports)

[vibhavkatre]

First of three cleanup passes (backlog #9: refactor, optimise, remove unused/dead code). This one is pure deletion — no behaviour changes.

Every removal was verified unreferenced from both source and tests, accounting for unplugin-vue-components auto-import (components can be used without an explicit import, so tag-name usage was checked too).

Orphaned files — 282 lines

File	Why it's dead
useHoverArrows.js	Select-mode hover arrows were removed. HoverArrows.vue does its own connector-anchor logic and never imported this composable.
NewDiagramDialog.vue	The diagram-type picker, dropped when "New diagram" started creating a unified doc directly.
TextSection.vue	Superseded by the text controls in BlockSelectionEditor.

Unreachable exports

• deleteNode (mindmapOperations) — the plural deleteNodes is what callers use
• reassignBranchColors (mindmapOperations) — never wired to a control
• isLocked (shapeFlags) — isInteractable covers every caller's need
• THEME_PRESET_NAMES (theme) — presets are read via findThemePreset
• STROKE_KINDS (whiteboardModel) — stroke kind is set at the call site
• toggleOutline + outlineVisible, notesNodeId (mindmapUi) — vestigial state for an outline/notes side panel that was never built; nothing read either field

Dependency

Dropped @tiptap/extension-underline — Tiptap 3 ships Underline inside starter-kit, so the direct dep was redundant. yarn.lock is unchanged, which confirms it was already resolving transitively.

Also commits the stale components.d.ts regeneration (DriveMenu was added in #23 but the generated file was never committed).

Four unwired features found — deliberately KEPT

Code that exists but nothing can reach. Deleting these would cement the gap, so each now carries a comment saying it's unwired:

1. unlinkNodes — cross-links can be created from the mind-map overlay but there is no way to delete one
2. toggleFocus — focus mode renders correctly (MindMapNodeLayer reads focusId) but has no activator
3. startPaletteDrag — the canvas drop handler is live, but no palette tile produces the drag payload, so drag-a-tool-onto-canvas is unreachable
4. duplicate_diagram (backend) — no UI calls it

These are worth triaging as part of the Phase-1 unified-canvas fix pass.

Testing

• 102 vitest tests pass
• yarn build clean

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable regressions identified.

All removed files, exports, and UI-state fields have no remaining consumers, while underline support remains provided and configured through Tiptap StarterKit.

_{Reviews (1): Last reviewed commit: "refactor: remove frontend dead code (orp..." | Re-trigger Greptile}